For largely the same reason that these GENETICS play a role in the ABILITY OF SOME TO METABOLIZE A MEDICATION INTO AN ACTIVE OR INACTIVE METABOLITE, (or to run fast, or jump high) GENETICS also play a role in the ability to function within our WESTERN society ---and as evidenced by criminality, educational scores, joblessness etc. some peoples GENETICS are better than others at THAT as well. You na´ve twit.